Miu and Takashi have been married for three years, and they live under the same roof with Takashi's father. Miu and Takashi were close when they were newlyweds, but Takashi started coming home in the morning, and now the couple doesn't talk to each other. The husband's father was worried about his son and daughter-in-law. But he couldn't do anything about it. One day, the father witnessed Miu masturbating alone.